221453 has 2 divisors, whose sum is σ = 221454. Its totient is φ = 221452.

The previous prime is 221447. The next prime is 221461. The reversal of 221453 is 354122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 218089 + 3364 = 467^2 + 58^2 .

It is a cyclic number.

It is not a de Polignac number, because 221453 - 2⁸ = 221197 is a prime.

It is a plaindrome in base 9.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110726 + 110727.

It is an arithmetic number, because the mean of its divisors is an integer number (110727).

2²²¹⁴⁵³ is an apocalyptic number.

It is an amenable number.

221453 is a deficient number, since it is larger than the sum of its proper divisors (1).

221453 is an equidigital number, since it uses as much as digits as its factorization.

221453 is an evil number, because the sum of its binary digits is even.

The product of its digits is 240, while the sum is 17.

The square root of 221453 is about 470.5879301470. The cubic root of 221453 is about 60.5007171556.

Adding to 221453 its reverse (354122), we get a palindrome (575575).

The spelling of 221453 in words is "two hundred twenty-one thousand, four hundred fifty-three".